> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/get-started/samples/layer-separation.md).

# Layer Separation for PDF - Sample code

Identify & separate layers in a PDF using JavaScript. Show or hide layers in a PDF by toggling them on / off directly their web browser.

{% hint style="info" %}
**Requirements**

*These packages are required to use these features in production. Trial keys have unlimited access to all features*

<a href="/web/get-started/readme.md" class="button primary">Web SDK</a><a href="https://showcase.apryse.com/pdf-layers" class="button primary">Live demo</a>
{% endhint %}

This JavaScript sample lets you identify & separate layers in a PDF document (no servers or other external dependencies required). This sample also gives you the option to show or hide different OCG (Optional Content Group) layers in a PDF document.

This functionality is commonly used in the construction & engineering space where users can hide irrelevant graphical content (HVAC, Electrical or Piping elements) from a blueprint. This sample works on all browsers (including IE11) and mobile devices without using plug-ins.

For an example of this functionality visit our [PDF Layer Separation demo](https://showcase.apryse.com/pdf-layers/).

Learn more about our [Web SDK](/web/get-started/guides.md).

{% tabs %}
{% tab title="JavaScript" %}
{% code lineNumbers="true" %}

```js
// eslint-disable-next-line no-undef
const WebViewerConstructor = isWebComponent() ? WebViewer.WebComponent : WebViewer;

WebViewerConstructor(
  {
    path: '../../../lib',
    initialDoc: '../../../samples/files/construction-drawing-final.pdf',
  },
  document.getElementById('viewer')
).then(instance => {
  samplesSetup(instance);
  const { documentViewer } = instance.Core;
  instance.UI.openElements(['leftPanel']);
  instance.UI.setActiveLeftPanel('layersPanel');
  documentViewer.addEventListener('pageComplete', () => {
    instance.UI.closeElements(['loadingModal']);
  });
});
```

{% endcode %}
{% endtab %}
{% endtabs %}


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